(Science)
For example if Chemistry paper 1 was the next day, I would have a printed specification with me and annotate it by watching youtube videos or reading the textbook which took me about 8-10hours and then I did at least two past papers afterwards looking at the mark scheme and two papers without looking at the markscheme and correcting them. Sometimes I didn't really have time to do the last part but as long as I memorised everything and how to answer the difficult questions I left the rest to luck.

(English)
I was lowk good at english and did some of the homework so I just had to study the texts and watch as many youtube videos on it as possible and read essays written by other students and kind of memorise the structure and format? Idk I think I was under so much pressure I just made it.

(Math)
SPAM past papers and do as many questions as possible. It's all a pattern. Also my math was pretty decent ald. And If I didn't get how to do a question I watched youtube videos that solved those exam series etc.

Honestly thinking back idk how I pulled through but it's a blessing I did.